About a dozen years ago, the Rough Guides and Lonely Planet series of travel books, rival bibles for the footloose and fancy free, crossed a new frontier onto the Internet. But they found their road maps to the digital future hard to read.
Guidebooks were soon overtaken online by Internet-era upstarts like TripAdvisor.com, which draws content from volunteer contributors and revenue from links to online reservations systems and advertising.
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